diff --git a/taglib/mpeg/id3v2/frames/chapterframe.cpp b/taglib/mpeg/id3v2/frames/chapterframe.cpp
index d45af5fb..e5c92b0e 100644
--- a/taglib/mpeg/id3v2/frames/chapterframe.cpp
+++ b/taglib/mpeg/id3v2/frames/chapterframe.cpp
@@ -37,7 +37,11 @@ class ChapterFrame::ChapterFramePrivate
 {
 public:
   ChapterFramePrivate() :
-    tagHeader(0)
+    tagHeader(0),
+    startTime(0),
+    endTime(0),
+    startOffset(0),
+    endOffset(0)
   {
     embeddedFrameList.setAutoDelete(true);
   }